Active weather will impact the northern tier of the country on Saturday, while a dry weather pattern prevails over the West Coast.
A low pressure system will strengthen as it moves east northeastward across the northern Plains and south central Canada. A cold frontal boundary associated with this system will extend south southwestward from the northern Plains to the Four Corners. As this frontal boundary transitions eastward, it will collide with warm and humid air from the Gulf of Mexico. This interaction will lead to strong to severe thunderstorms across the Midwest and the Plains. Severe thunderstorms will be possible in southeast South Dakota, northeast Nebraska, northern Iowa, Minnesota, Wisconsin and northwest Michigan. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain will bring threats of flash flooding to eastern Minnesota, northeast Iowa, Wisconsin and northwest Michigan. Showers and isolated thunderstorms are also expected to fire up in parts of the Desert Southwest.
Meanwhile, the tail end of a frontal boundary will sink southward over the East Coast. This frontal system will initiate scattered showers and thunderstorms across the southern Mid-Atlantic and the Southeast.
Most areas west of the Continental Divide will experience dry weather on Saturday.
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